The Leverage FeatureBox widget helps build your email list with high converting opt-in feature boxes that turn your website visitors into subscribers.
Plugmatter Optin Feature Box is the Only List Building Plugin that Allows You to Create High Converting Optin Feature Boxes for Your WordPress Site.
Build your FeedBlitz email newsletter subscription list faster with simple checkboxes on user registration and / or comment forms.
Easily subscribe to a P2 comment thread without commenting using a "Follow" action link like WordPress.com has
KN Social Slide is a free WordPress Plugin that lets your visitors know about your facebook, twitter, google+, feedburner and random entry!
Send registration info to GetResponse Service